SINTERED COMPACT OF ALUMINUM ALLOY POWDER HAVING LOW COEFFICIENT OF FRICTION AND ITS PRODUCTION

摘要

PURPOSE: To obtain a sintered compact having a low coefft. of friction, excellent in wear resistance and especially suitable for use as the drum of VTR. CONSTITUTION: This sintered compact is made of an Al alloy contg. 14-30% Si. The average grain size of Si grains existing in the matrix of the alloy is <2μm and the density is >=99% of the true density of the Al alloy. Alloy powder is put into a compacting mold and compressed by applying 10-200MPa pressure and the resultant compact is sintered by heating to >350 to 500 deg.C with a supplied pulsating current under pressure.